Make sure you quit Flask's development server. Remember that you just need to press
Ctrl
+
C
in the Terminal or Command Prompt window in which it is running. Now, we will install many additional packages. Make sure you have activated the virtual environment we have created in the previous chapter and we named Flask01. In case you created a new virtual environment to work with this example or you downloaded the sample code for the book, make sure you install the packages we used in the previous example.
After you activate the virtual environment, it is time to run commands that will be the same for either macOS, Linux, or Windows. We can install all the necessary packages with pip with a single command. However, we will run independent commands to make it easier to detect any problems in case a specific installation fails.
Now, we must run the following command to install Flask-SQLAlchemy with pip. Flask-SQLAlchemy adds support for the SQLAlchemy...
